Email DMARC Policy Checker

Check DMARC (Domain-based Message Authentication, Reporting & Conformance) policies with focus on email deliverability impact. Understand how DMARC affects your email delivery and reputation.

DMARC Examples

DMARC Policy Check

Understanding DMARC for Email Delivery

DMARC Policies & Email Impact

none: Monitor mode - no delivery impact, collect data only
quarantine: Failed messages may go to spam/junk folder
reject: Failed messages rejected outright - strongest protection

Email Delivery Best Practices

  • Start with p=none to monitor before enforcement
  • Gradually increase to p=quarantine then p=reject
  • Set up aggregate reporting to monitor delivery
  • Test alignment requirements carefully
  • Consider subdomain policy for comprehensive coverage

Alignment Modes & Delivery

Relaxed (r): Allows organizational domain matching (safer for delivery)
Strict (s): Requires exact domain matching (higher security, delivery risk)

Common Delivery Issues

  • Strict alignment with third-party senders
  • Forwarded emails failing DMARC checks
  • Mailing lists modifying message headers
  • Percentage rollout causing inconsistent delivery